<template>
    <div class="numberPad">
        <div class="output">{{output}}</div>
        <div class="buttions">
            <button @click="inputContent">1</button>
            <button @click="inputContent">2</button>
            <button @click="inputContent">3</button>
            <button @click="remove">删除</button>
            <button @click="inputContent">4</button>
            <button @click="inputContent">5</button>
            <button @click="inputContent">6</button>
            <button @click="clear">清空</button>
            <button @click="inputContent">7</button>
            <button @click="inputContent">8</button>
            <button @click="inputContent">9</button>
            <button class="ok">OK</button>
            <button @click="inputContent" class="zero">0</button>
            <button @click="inputContent">.</button>
        </div>
    </div>
</template>

<script lang="ts">
    import Vue from "vue";
    import {Component, Prop} from "vue-property-decorator";

    @Component //装饰器
    export default class NumberPad extends Vue {
        output = "0";

        inputContent(event: MouseEvent) {
            const button = (event.target as HTMLButtonElement); // 强制指定类型，如果不指定，你没法判断event是什么类型
            console.log(button.textContent);
            const input = button.textContent!;  // 感叹号和下面一行用法一样，就是这个东西不会为空
            // const input = button.textContent as string;
            if (this.output.length === 16) {
                return;
            }
            if (this.output === "0") {
                if ("0123456789".indexOf(input) >= 0) {
                    this.output = input;
                } else {
                    this.output += input;
                }
                return;
            }
            if (this.output.indexOf(".") >= 0 && input === ".") {
                return;
            }
            this.output += input;
        }

        remove() {
            if(this.output.length === 1){
                this.output = '0';
            }else {
                this.output = this.output.slice(0, -1);
            }
        }

        clear() {
            this.output = '0'
        }

        // ok() {
        // }
    }
</script>

<style lang="scss" scoped>
    @import "~@/assets/style/helper.scss";

    .numberPad {
        .output {
            font-size: 36px;
            font-family: Consolas, monospace; // 等宽字体，Consolas是windows的，monospace是编程字体
            padding: 9px 16px;
            text-align: right;
            height: 72px;
            @extend %innerShadow;
        }

        .buttions {
            // 代替clearfix,但是如果写在这里就会很重复，那么我们就使用变量的方式，我与重复不共戴天。
            /*&::after{*/
            /*    content: '';*/
            /*    display: block;*/
            /*    clear: both;*/
            /*}*/
            // 此处引用helper.scss的变量
            @extend %clearFix;

            > button {
                width: 25%;
                height: 64px;
                float: left;
                background: transparent;
                border: none;


                &.ok {
                    height: 64*2px;
                    float: right;
                }

                &.zero {
                    width: 25*2%;
                }

                $bg: lightgreen;

                &:nth-child(1) {
                    background: $bg;
                }

                &:nth-child(2), &:nth-child(5) {
                    background: darken($bg, 4%);
                }

                &:nth-child(3), &:nth-child(6), &:nth-child(9) {
                    background: darken($bg, 4*2%);
                }

                &:nth-child(4), &:nth-child(7), &:nth-child(10) {
                    background: darken($bg, 4*3%);
                }

                &:nth-child(8), &:nth-child(11), &:nth-child(13) {
                    background: darken($bg, 4*4%);
                }

                &:nth-child(14) {
                    background: darken($bg, 4*5%);
                }

                &:nth-child(12) {
                    background: darken($bg, 4*6%);
                }
            }
        }
    }

</style>